In a large skillet over medium heat cook sausage until done; remove and drain. Slice if using link sausage.
In a small bowl beat together eggs, milk, salt and mustard; mix well.
Grease bottom of a 13x9x2-inch baking pan. Arrange bread crumbs on bottom, sausage and cheddar cheese. Pour egg mixture over top, cover and refrigerate overnight.
When ready to bake, preheat oven to 350° F.
Bake for 45 minutes or until eggs are set and cheese is melted and golden. Let stand about 5 minutes before cutting.Servings: 6